Write a letter to grandpa, similar to the one of Active Exploration 1 in Chapter 3. Tell him that Galileo introduced the concepts of acceleration and inertia, and was familiar with forces, but didn’t see the connection between these three concepts. Tell him how Isaac Newton did, and how the connection explains why heavy and light objects in free fall gain the same speed in the same time. In this letter, it’s okay to use an equation or two, as long as you make it clear to grandpa that an equation is a shorthand notation of ideas you’re explaining.
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